Chester used to sell backplates, which is where i found the details of the thread for my Engineers ToolRoom BL12/24. The same lathe. with minor alterations is/was came to UK via three importers.
The Chester Craftsman, as far as I know, is available only in Metric form, whereas the Warco BH600 (and the long bed version BH900) were available in Imperial or Metric form. My Engineers Tool Room BL12/24 is basically Metric but fitted with dual dials. (mostly, I work in Imperial units)
Chucks are retained by two clamps, retained by M8 Allen screws) behind the chuck, so it can be run safely, in reverse. The first set of Tumbler gears were noisy, but replaced under warranty. The Faceplate fouled the Acrylic Chuck guard, but a little work on the plastic provided clearance.
The Screwcutting dial will be positioned on the Headstock or the Tailstock side of the Saddle, depending upon the Importer. I slightly modified mine, to move it from the Headstock side to the Tailstock side.
The 5MT spindle is useful since bar upto 38mm dia can be accomodated. With reducing sleeves, even a 2MT arbor can be used and then transferred to the Rotary Table for gear cutting on the Mill.
I thought that the finest feed, of 0.0047"/rev was a bit too coarse, so made a 80T gear to replace the 40T on the input to the Norton box. This meant moving the closure for the Gear Cover, (and destroying the Knob in the process), but am happy with the result.
So far, (after 13 years) as far as I am concerned, the machine does all that is required of it. I have screwcut at least three backplates to fit the Iathe. It has taken cuts of 0.100" a side without protest.
A while ago, there seemed to be a problem of belt slip, but this was actually caused by a lever in the belt tensioner under the Headstock cover slipping on the shaft. A deeper dimple in the shaft was the cure.
The worst problem was entirely due to my carelessness. (I ran the Saddle into the Headstock and damaged the shaft and pinion that meshes with the rack). Warco could supply spare parts from stock. So this seems to be a fairly regular failing on the part of users.
Another poster on this Forum kindly sent me instructions on removing the saddle.
In fact, I chose to make up my own parts for repair, without power feed, using the Cross Slide manually, and the Topslide. The biggest problem was afterwards, accessing the capscrews that clamp the Worm Housing to the Saddle. This is because the space between the saddle an the bed prevents a normal Allen key being used, and even a modified one is misaligned by ones fingers. However, the problem is not insuperable.
As part of this work, I fitted a nylon plug to a hole in the back of the Saddle, to raise the oil level and improve lubrication in the upper parts of the Saddle.
Hope that this is some help.
Howard